HCLHVAC Cost Lab

Calculators / Efficiency

Updated Jul 26, 2026 · Method and source links reviewed

Efficiency

Thermostat Savings Calculator

Test a conservative range of HVAC energy reductions instead of assuming one universal smart-thermostat savings claim.

Your planning inputsUpdates automatically
$
Exclude lights, appliances, and non-HVAC energy.
%
Test a conservative range based on current schedules.
$
Include professional installation if required.

Estimated result

$176/year

8% modeled HVAC reduction; simple payback: 1.4 years.

How to use this estimate

  • Homes already using disciplined setbacks may save less.
  • Heat pumps need compatible controls that do not trigger unnecessary auxiliary heat.
  • Comfort and remote monitoring can add value beyond energy payback.

Transparent method

We expose the planning formula so you can challenge it and replace assumptions with local evidence.

annual HVAC energy cost × expected reduction percentage

What this calculator cannot see

  • Savings depend on climate, schedules, equipment, occupancy, and prior thermostat behavior.
  • Verify equipment and wiring compatibility before installation.

Professional verification

Use this result to prepare questions and compare scenarios. Final equipment selection, electrical work, refrigerant work, combustion, duct design, and permitting should be handled by qualified professionals following local codes and manufacturer instructions.